[Webkit-unassigned] [Bug 175029] New: "position:sticky" does not work correctly in flex item

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=175029

            Bug ID: 175029
           Summary: "position:sticky" does not work correctly in flex item
           Product: WebKit
           Version: Safari 10
          Hardware: Macintosh
                OS: macOS 10.12
            Status: NEW
          Severity: Major
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: i.poluyanov at icloud.com

Element with "position: sticky" stucks in the bottom of the flex element with "overflow-y: auto" as if "overflow-y: auto" was not set.

Examples:

with "overflow-y: auto":
https://jsfiddle.net/4hwgfz4z/

without:
https://jsfiddle.net/ed95kw7x/

If i get rid of flex - everything is ok: 
https://jsfiddle.net/6bu8kua5/

Firefox and Chrome handle this case(https://jsfiddle.net/4hwgfz4z/) correctly, element stops in the bottom of scrollable element.

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